there is error while vlc2.1.0 sout audio coedc = mp4a
vlc udp://@239.19.204.128:3140 -vvv --sout "#transcode{vcodec=h264,vb=200,scale=1,width=320,height=240,acodec=mp4a,ab=64,channels=2,samplerate=48000}:http{mux=ts,dst=0.0.0.0:8888}" --no-sout-rtp-sap --no-sout-standard-sap --ttl=16 --sout-keep --sout-x264-tune=zerolatency --sout-x264-me=dia --sout-x264-subme=1
acodec=mp4a vlc pop up a error windows "failure, vlc cann't open the encoder"
acodec=mpga or acodec=mp3 both OK.